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              <link href='https://fonts.googleapis.com/css?family=Oswald:400,300,700' rel='stylesheet' type='text/css'>

<!-- [data-animate-header-container] - this is the header container used for calculating when the header is in/out of view -->
<header class='header' data-animate-header-container>

	<!-- [data-animate-header] - this is the actual element that will be fixed/animated -->
	<menu class='header-bar' data-animate-header>
		<a href='#menu' class='btn-menu' data-toggle-class='menu-active'>Menu</a>
		<a href='#menu' class='btn-search' data-toggle-class='search-active'>Search</a>
	</menu>
</header>

<article class='article'>
	<header class='article-header'>
		<h1 class='article-title'>Animate header in &amp; out</h1>
		<span class='article-subtitle'>When white section hits top of screen.</span>
	</header>

	<!-- [data-animate-header-target] - this is where the header will animate -->
	<section class='article-section' data-animate-header-target>
		<p>Using jquery-waypoints, well be checking to see when [data-animate-header] (this section) is above the top of screen, then animate [data-animate-header] (the fixed header) in/out accordingly.  We're able to do this with css transitions and a combo of 3 classes (.header-past, .header-show, .header-hide) - without having to clone or do any dom manipulating.</p>
	</section>
</article>
            
          
!
            
              // Demo Reusables
$cubic-bezier: cubic-bezier(0.215, 0.61, 0.355, 1);
$font: 'Oswald', sans-serif;
$header-height: 40px;

// Calc
@mixin calc($property, $value) {
	#{$property}: -webkit-calc(#{$value});
	#{$property}:    -moz-calc(#{$value});
	#{$property}:         calc(#{$value});
}

// Fonts
%font-bold {
	font-weight: 700;
}

%font-light {
	font-weight: 300;
	letter-spacing: .15em;
}

%font-regular {
	font-family: $font;
	font-weight: 400;
}

// Crispy/Better Font Rendering
%text-crispy {
	-webkit-font-smoothing: antialiased;
	-moz-osx-font-smoothing: grayscale;
}

// Demo Styles
* {
	box-sizing: border-box;
	margin: 0;
	padding: 0;
}

body {
	@extend %font-regular;
	// @extend %text-crispy;
	background-color: #F4F4F4;
	color: #2b2b2b;
	font-size: 14px;
	letter-spacing: .1em;
	text-align: center;
}

body, html, article {
	height: 100%;
}

// Page Header
.article-header {
	background-color: #E31E25;
	color: white;
	display: flex;
	flex-flow: column;
	height: 80%;
	justify-content: center;
	line-height: 1.3;
	min-height: 200px;
	padding: 2em 4% 2em;
	@include calc('padding-top', '2em + #{$header-height}');
}

.article-section {
	line-height: 200%;
	margin: 0 auto;
	max-width: 680px;
	padding: 3em 2em 100vh;
	text-align: justify;
}

.article-subtitle {
	@extend %font-light;
	font-style: italic;
	display: block;
}

.article-title {
	@extend %font-light;
	font-size: 1.8rem;
	margin-bottom: 10px;
	text-transform: uppercase;
}

.header-bar {
	display: flex;
	font-size: 12px;
	justify-content: space-between;
	text-transform: uppercase;

	a {
		color: white;
		text-decoration: none;
	}
}

// Fixed Header (Layout Stuff & Animations)
// [data-animate-header]
[data-animate-header] { // use class selector in production
	background-color: #1b1b1b;
	left: 0;
	padding: 12px 10px 11px; // 40px
	position: absolute;
	right: 0;
	top: 0;
	z-index: 1;

	// Hide the header offscreen so we can transition it in later
	.header-past & {
		position: fixed;
		top: -$header-height;
	}

	// Hide the header (slideUp)
	.header-past.header-hide & {
		top: -$header-height;
		transition: top .85s $cubic-bezier;
	}

	// Show the header (slideDown)
	.header-show & {
		top: 0;
		transition: top .85s $cubic-bezier;
	}
}
            
          
!
            
              // External js being loaded - https://cdnjs.cloudflare.com/ajax/libs/waypoints/2.0.5/waypoints.min.js
$(function() {
    waypoints.init();
})

var waypoints = {
    init: function() {
        // container - used for toggling classes to animate content
        this.container = $('html');

        // header - main header container: an inner wrapper element should get fixed (.header-bar)
        this.header = $('[data-animate-header-container]');

        // headerHeight - the inner header element that gets fixed
        this.headerHeight = $('[data-animate-header]').outerHeight();

        // targetElement - when this element hits top of screen the header  animates
        this.targetElement = $('[data-animate-header-target]');

        // bindControls
        this.bindControls();
    },
    animateHeader: function() {
        var self = this;

        // Add class when header is in/out of view
        self.header.waypoint(function(direction) {
            if (direction === "up") {
                self.container.removeClass('header-past header-hide');
            } else {
                self.container.addClass('header-past');
            }
        }, { offset: -self.headerHeight });

        // Animate header in when this element hits top of screen
        self.targetElement.waypoint(function(direction) {
            if (direction === "up") {
                self.container.addClass('header-hide').removeClass('header-show');
            } else {
                self.container.addClass('header-show').removeClass('header-hide');
            }
        }, { offset: 0 });
    },
    bindControls: function () {
        var self = this;

        self.animateHeader();
    },
}
            
          
!
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